Plant for the supervision of the circulation lubrication on power cars



July 3, 1923. 1,460,500

M. RALL PLANT FOR THE SUPERVISION OF THE CIRCULATION LUBRICATION ONPOWER CARS Filed May 26, 1922 Patented July 3, 1923.

warren stares v arrests rarest oasis.

MAX RALL, OF STUT'I'GART, GERMANY, ASSIGNOR TO ROBERT BOSCHAKTIENGESELL- SCHAFT, OF STUTTGART, GERMANY.

ELANT FOR THE SUPERVISION OF THE CIRCULATION LUBRICATION ON POWER CARS.

Application filed ma 26, 1922. Serial No. 563,992.

T 0 all whom it my concern:

Be it known that 1, MAX BALL, a citizen of Germany, residing atStuttgart, Germany, have invented certain new and useful Improvements ina Plant for the Supervision ofthe Circulation Lubrication on Power Cars,of which the following is a specification.-

For the supervision of the circulation of the lubrication oilon powervehicles, mechanical indicators have already been devised which areinserted into the pressure or delivery pipe for the lubricatin oil andindicate by the position of a movable member whether or not the pressurein that pipe is that required. The indicating member is, however, butdiificultly to be discerned from some distance, and superintending thelubrication at night by that means is extremely unreliable.

These draw backs are obviated by means of the present invention, thegist of which consists in making a member, acted on by the oil-pressure,control a contact inserted into the circuit of an electric indicatingmeans, such as a lamp or the like, in such a manner, that the lamp etc.is switched in only when, or after, a certain oil pressure is, or hasbeen reached. If the respective power vehicle is equipped with alighting dynamo, the circuit of the lamp or other indicating means ispreferably connected up directly to the terminals of that dynamo, butnot branched ofi behind the usual automatic switch between the dynamoand the battery, the purpose of the first-mentioned arrangement being toprevent the supervision means for the circulating lubrication oil frombeing injuriously acted on in the case of the switch becoming defective.Besides, a

special switch for the control-circuit maybe dispensed with. Myinvention is illustrated by way of ex amp e -in the accompanyingdrawing, in

' whichFig. 1 is a diagrammatical representation of a plant embodyingthat invention. Fig. 2 is a modified detail, viz, of the membets 4 and 5of Fig. 1.

Connected with the pressure or delivery pipe 1 of the oil circulationpump 2 is a box 3 which is closed at its top by a diaphragm 4, thatbulges out more or less according to the ressure of the oil in thepipe 1. The diap ragm acts upon a. contact 5 inserted into a circuit 6connected up directly to the terminals of the lighting dynamo 7 andhaving inserted into it the indicating lamp 8. This circuit is perfectlyindependent of the automatic switch 9 and the other lamp circuit 10 sothat the lubrication may be constantly and automatically superintended.In Fig. 1 the contact 5 is broken, as is consequentl also the circuit 6of the lamp 8, thus indicating that the pressure of. the oil in the pipe1 has the proper height. This being so, the diaphragm is so much bulgedout that, as shown, the contact 5 is broken. But as soon as the pressureof the oil in the pipe 1 sinks to or below a certain predetermineddegree, the diaphragm 4 is bulged out correspondingly less or, may be,not at all, so that the contact 5 is closed. At once the lamp 8 lightsup, indicating a disturbance in the lubrication conduit.

Connecting up the circuit 6 directly to the terminals of the lightingdynamo offers the advantage that the plant is independent of theposition of the automatic switch 9 sothat the driver is not compelled tochange now and then the position of this switch in order to ascertainthe condition of the plant. This examination proceeds quiteautomaticallyhwhen the motor is started and stopped.

en starting the motor, the lamp 8 does not immediately light up becausea current of suflicient strengthis not "instantly generated, but after avery short time sufficient current is generated and the lamp lights up,on the onehand because there is sufiicient current in the circuit 6, andon the other hand, because there is not yet sufiicient pressure in theoil pipe 1. But again after a short time the engine has produced therequisite pressure in the pipe 1, the diaphragm 4 bulges out, thecontact 5 is broken,

that the plant is in proper working. condition.

While, in the form of construction of the contact shown in Fig. 1 at 5the circuit is opened when the proper pressure has been reached in thepipe 1, it is closed in the modified form. of construction shown in Fig.2. This is at once obvious without a detailed explanation. The lamp isthus burning as long as that pressure is maintained.

It is also obvious that the lamp 8 may be replaced by any other suitbaleindicating means, for instance a rotary disk, a hand and the like.Making use of a lamp offers the advantage that the lubricatinginstallation may be superintended also in the evening and at night-timeand with the same reliability as at day-light.

The circumstance that the indicating installation operates only when thelighting dynamo operates is of no consequence because also thecirculation-lubrication operates only when the car motor is running.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent of the United States is:

1. In a device of the class described, the combination, with an engine,an oil circulating system for said engine, and means driven by theengine for forcing oil under pressure through said system, of a memberadapted to be controlled by the pressure of the oil in said system,electric indicating means, a dynamo operated by said engine, an electriccircuit connected directly to the terminals of said dynamo, saidindicatin means being connected in said circuit, and a circuit breakerconnected in said circuit and controlled by such oil-pressure-controlledmember.

2. In a device of the class described, the combination, with an engine,an oil circulating system for said engine, and means driven by theengine for forcing oil under pressure through said system, of anelectric lamp, a dynamo operated by said engine, an electric circuitconnected directly to the terminals of said dynamo, said lamp beinconnected in said circuit, and means in said oil circulating systemincluding a diaphragm for maintaining the electric circuit MAX BALL. [1s.]

Witnesses O'rro WAGNER, [1,. s.] BERTOLD A. BRAUN. [1,. 5.]

